-vac aaaa aaab aaac aaar aaav aaba aabb aabc aaca aacb aacc aaco aacr aacv aaoo aara aarc aaro aava abaa abab abac abar abb- abba abbb abbo abbr abca abcb abcc abcr aboa abob aboo abor abov abra abrc abro abva acaa acab acac acar acba acca accc acco acoa acor acr- acra acrc acro acrr acrv acvv aoba aoca aora aorb arab arac arar arba arc- arca arco aroa arob aroo aror arr- arra arrc arro arrr arva arvo avab avao avar avcc avco avor avra avro avva avvo baaa baar baba babb babo babr bac- baca bacc baco bar- bara barb barc baro barr bava bbbb bbrc bcaa bcar bcbc bcca bccc bcor bcra bcvo boab boac boar boba bobb bobo boca boco boob booc boor bor- bora boro borr bova bovo brab brac brao brav brca brcb broa brob broc broo bror brrr c-bo caaa caab caac caba cabo cac- caca cacc caco cacr caor cara carb carc caro carr cava cavo cbac cbar cbbc cbca cbcc cbcr cbva cbvb cbvr ccaa ccab ccac ccar ccba ccbc ccca cccb cccc cccv ccob ccoc ccra ccrc ccvo coba cobb cobo coca coco coob cor- cora corb corc coro corr cova covo crab crac crar crbc crca crcc crcr crob croc croo cror cvac cvar cvca cvcc cvra cvrr oara obba obbo obor obra obro ocab ocac ocbc occa occc ocra ocro ocrr ooaa ooba oocr oooo oora orab orac orao orar orav orba orbb orbo orca orco oro- oror orra orro orvr ovar ovo- ovoo ovra raab raba rabb rabo rac- raca racc raco racv raob raoc rara rarb raro rava rbbb rbbr rcac rcbc rcbo rccb rccc rcvr roab roar rob- roba robb robo roca rocc roco roob roor rora rorc roro rova rovo rrrr rv-c rvca vaar vaca vaco vara varr vava vbcc voar voca vooc voor vor- vora voro vrac vrav vrba vroc vvob vvvv